The first videophone service (1970) : a million within ten years...

Despite far from encouraging market research findings, AT&T executives in the USA were convinced that their Picturephone system would eventually be a winner. Following a six year trial, a commercial Picturephone service made its debut in Pittsburgh in 1970, with AT&T executives confidently predicting that a million sets would be in use by 1980.
They were wrong. Take-up was painfully slow and the service was later withdrawn. Despite its improvements, Picturephone was still big, expensive and uncomfortably intrusive. There was also doubt as to whether people actually wanted to be seen on the phone at all (indeed, there's quite a lot of research in the industry which proves they don't!).